Welcome to The Tortoise Table.
There is no set rule, and some people would say that you only need to see a vet if you suspect that your tortoise is unwell. Personally, I take mine for a check-up ever year or two (unless they are unwell), just to be on the safe side, and I always take a fresh sample of poo so that it can be checked for parasites (various species of worms are common, and do no harm if in small numbers but if there is a heavy infestation then the tortoise will need to be wormed -- which is quite easy).

It is important that you see a vet who has been trained to treat 'reptiles, or 'exotics' (which included reptiles), as normal vets don't have much training in reptiles and can get it very wrong on occasion. We have a list of vets in the UK, recommended by tortoise keepers and organised by area on our webite here: http://www.thetortoisetable.org.uk/tort ... s-by-area/

And just out of curiosity, when you say you do not plan to hibernate your spur thigh, do you mean this year or ever?

Hope that helps and please don't hesitate to contact us again if you have any more questions or problems.